E30 the biowaste - metamorphosis to M52

[ForcedFirebird]

Looks to be about right based on a backwards-math BHP number. I see in the 220-230whp with setups like yours, so if you add 20%, you should be 260-276 at the wheels.

I just don't like it when they scale the graphs like that. Makes you have to read the hp and tq independently - that's not a "real-world" graph IMO, since the numbers should cross at 5252rpm.

[hasa]

Just a bait for the search engines: Toyo R888R was 2 sec slower per lap than Kumho V70a. Both 235/40-17.

[hasa]

Season is over. Time for repairs and upgrades.

[hasa]

[hasa]

After season 2024 I came to conclusion that my path with M20 engine platform is done. I'm 100hp behind my competitors and there are two main scenarios how to catch that: going 24v or 2.0 litre turbo. I know by experience that turbos bring lot of challenges to heat management and it is hell to drive, so my choise is 24v, specially M52 aluminium block.

I started by sourcing used M52B25 and dismantled it to pieces to understand the basics. Head went to porting process.



Nikasil block was worn out ( deck height 210mm btw ) so I purchased new block with iron liners




Engine basic specs will be

85,8 stroke
84 bore
2850cc
Forged pistons
140mm H-beam rods
Cat Cams valvetrain
M3 itb intake system with adapter
Headers

I'm still struggling to invest to dry sump but all experts recommend that because engine likely needs to rev up to 9000. There is lot to learn. All information is appreciated!

[digger]

How many powerz do you want?

[hasa]

How many powerz do you want?

I know some racer fellows who have similar engines having 350-380bhp depending on details. Even the 350bhp would help me to next level.

[digger]

I know some racer fellows who have similar engines having 350-380 bhp depending on details. Even the 350 bhp would help me to next level.

You're definitely going to need to turn at least 8000-8500 rpm with "only" 2,853 cc and so probably would want a ATI super damper

What fuel will you use? E85 ?

The power is in the cylinder head, induction system and camshaft(s). The cylinder head is going to need some "work" have you flowed it and measured the cross sectional areas from a baseline before sending it off?

[moatilliatta]

https://rabidracingdev.com/products/rrd-gdm-cnc-ported-race-cylinder-head

This is next on my todo list.

[AWDBOB]

https://rabidracingdev.com/products/...-cylinder-head

This is next on my todo list.

That is an incredible value for what it is- wish someone offered that service for an 885.

[digger]

That is an incredible value for what it is- wish someone offered that service for an 885.

Pretty sure Rama has a digitized 885 that he gets done by CNC place (iirc it is RAMS)

but who says that RRD stuff is any good?

[AWDBOB]

Pretty sure Rama has a digitized 885 that he gets done by CNC place (iirc it is RAMS)

but who says that RRD stuff is any good?

We need a source in the US - shipping both ways adds $600+ to the cost. I emailed Rama ages ago about leasing out his files per use here but he didn't have any interest. Grooty's CNC project got derailed by his engine exploding. Its hard out here in 885 cnc land

RRD has a good track record for quantifiable results, generally speaking

[hasa]

You're definitely going to need to turn at least 8000-8500 rpm with "only" 2,853 cc and so probably would want a ATI super damper

What fuel will you use? E85 ?

The power is in the cylinder head, induction system and camshaft(s). The cylinder head is going to need some "work" have you flowed it and measured the cross sectional areas from a baseline before sending it off?

ATI with MRT adapter or one local less known product are my choises for a damper. Surely crucial component for bottom end to live.

E85 yes, absolutely!

Cylinder head project is ongoing and not in my hands so I have not much to tell about it yet. Port design, valves, cams, lifters, shimming, springs and retainers follow anyway a previously developed concept.

[Northern]

I know people have had success on the 2.8 steel bottom end >8K without, but I'd bare minimum put the 'Racing' 11417576915 oil pump chain on it and use an S54 oil pump tensioner setup, plus an upgraded pump(or at least the rotor shaft/sprocket), but I don't even know which pump upgrade is 'the best' anymore because there have been a lot of them over the years.

I like what ba114 did on his dual vanos engine and use an M54 pump for the bigger rotor running at lower RPM, but given the M54's issues, I wouldn't want to guinea pig the pump at high RPM.

I know there are a handful of 9K RPM people out there on this platform, some of them in the FI groups on facebook. Not sure how willing they are to share.

[hasa]

Thanks for all insights. I'm still trying to figure out if my budget allows dry sump, but at least the oiling system must be taken seriously.

Crank seems to be straight at least. I can see only 0.02mm runout.